Sri KDU Form 3 Science Mock Exam Revision (Sections B & C)

Comprehensive fill-in-the-blank practice flashcards covering Form 3 Science revision content across Chapters 1 to 10 (Stimuli, Respiration, Transportation, Reactivity of Metals, Thermochemistry, Electricity and Magnetism, Energy and Power, Radioactivity, Space Weather, and Space Exploration).

The two components of the central nervous system are the __________ and the spinal cord.

brain

Unlike a nastic response, a tropic plant response depends on the __________ of the stimulus.

direction

The pathway of inhaled air in the human respiratory system is: Nostril → trachea → bronchus → __________ → alveolus.

bronchiole

During inhalation, the diaphragm __________ and flattens.

contracts

In cigarette smoke, __________ causes addiction, while carbon monoxide reduces oxygen transport by haemoglobin.

nicotine

While fish exchange gases using gills and leaves use stomata, insects carry out gas exchange through a __________.

tracheal system

In human blood, __________ are cell fragments responsible for blood clotting.

platelets

In vascular plants, xylem transports water and mineral salts, whereas phloem transports __________.

products of photosynthesis

Metals that are positioned higher than carbon in the reactivity series are extracted by the __________ of the molten metal compound.

electrolysis

During the thermal decomposition of calcium carbonate, the solid product formed alongside carbon dioxide is __________.

calcium oxide

An exothermic reaction __________ heat to the surroundings, resulting in a temperature rise.

releases

Dissolving ammonium chloride in water causes the temperature of the solution to fall, classifying it as an __________ reaction.

endothermic

In a step-up transformer, the coil turns relationship between secondary turns ($N_s$) and primary turns ($N_p$) is __________.

$$N_s > N_p$$

In a three-pin plug, the __________ wire provides a safe path for leakage current in the event of an electrical fault.

earth

Household electrical energy consumption is recorded by a meter using the billing unit of the __________.

kilowatt-hour (kWh)

Work is defined as force multiplied by displacement in the direction of the force, and its SI unit is the __________.

joule (J)

The time required for half the unstable nuclei in a radioactive sample to decay is termed the __________.

half-life

In order of increasing penetrating power, radioactive emissions are arranged as: __________ → beta → gamma.

alpha

Alpha radiation is stopped by a sheet of paper, beta radiation is stopped by aluminium sheet, and gamma radiation is strongly attenuated by __________.

thick lead

The three atmospheric layers of the Sun, from inner to outermost, are the photosphere, chromosphere, and __________.

corona

The solar cycle has an approximate duration of __________ years.

$$11$$

Earth is shielded from harmful high-speed charged particles from the solar wind by the Earth's __________.

magnetosphere

Johannes Kepler improved on earlier astronomical models by proposing that planetary orbits are __________.

elliptical

The first Malaysian astronaut to enter space was __________.

Dato’ Dr Sheikh Muszaphar Shukor

In short-sightedness, light rays converge in front of the retina, and the defect is corrected using a __________ lens.

concave

Sound vibrations are transmitted from the ossicles through the __________ window before reaching the cochlea.

oval

The muscular wall of the left ventricle is thicker than that of the right ventricle because it must generate greater pressure to pump blood to the __________.

whole body

When a tree trunk is ring-barked, the removal of the __________ prevents the downward movement of manufactured food, leading to swelling above the cut.

phloem

In a blast furnace for extracting iron, limestone produces calcium oxide to remove impurities such as silica in the form of __________.

calcium silicate slag

To reduce eddy currents and energy loss as heat, the soft iron core of a transformer is __________.

laminated

A fuse is always connected in series along the __________ wire so that melting cuts off the appliance from high voltage.

live

If an appliance with a power rating of $1\,000\,\text{W}$ runs for $2\,\text{hours}$ daily for $30\,\text{days}$, its total energy consumption is __________.

$$60\,\text{kWh}$$

When the speed of a moving object is doubled while keeping its mass constant, its kinetic energy increases by a factor of __________.

$$4$$

If a radioactive isotope has an initial activity of $800\,\text{Bq}$ and a half-life of $20\,\text{minutes}$, its activity after $60\,\text{minutes}$ will be __________.

$$100\,\text{Bq}$$

A neutral atom transforms into a positively charged ion when it __________ electrons.

loses

The radioactive isotope commonly used in archaeological science to determine the age of ancient organic remains is __________.

Carbon-14

In industrial manufacturing, __________ radiation is selected for beta thickness gauges because its penetration varies sensitively with material thickness.

Beta

An aurora occurs when energetic charged particles from the Sun collide with atmospheric atoms and molecules near the Earth's __________.

poles